Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eceda38600ed169f6a9125f1698adb5efd70a6262880843e14ce5720492f89' 
  AND token = 'mrECvITvFi3u2qgTou/EMs7QZLcAnxzN9LWbPZ9Z+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}